/Engine/Source/Runtime/Landscape/Classes/Landscape.h
FScopedSetLandscapeEditingLayer ( [ALandscape](API\Runtime\Landscape\ALandscape) * InLandscape, const [FGuid](API\Runtime\Core\Misc\FGuid) & InLayerGUID, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< void()> InCompletionCallback )